Good evening, I'm running Samba 4.1.6 and OpenLDAP 2.4.31 on an Ubuntu 14.04 box. Since yesterday, Samba isn't able anymore to find my groups in the LDAP directory tree. I have no idea about this behavior; here are some lines copied from /var/log/samba/log.smbd: *** BEGIN *** ldap_connect_system: successful connection to the LDAP server Got user=[om] domain=[OEGNET] workstation=[HERMES] len1=24 len2=142 init_sam_from_ldap: Entry found for user: om ERROR: Got 0 entries for gid 1003, expected one primary group of [om] not found Failed to get groups from sam account. check_sam_security: make_server_info_sam() failed with 'NT_STATUS_INTERNAL_DB_CORRUPTION' *** END *** I omitted some lines with lower importance. My user account (om) has been found, my gidNumber (1003) is correct, but you see the error above. Can someone help, please? If you need further information, please let me know. Kind regards, Theo